I try to stay on top of light oil and grease. every 50-80hrs of runtime or so, i do a clean and reaply.
I pulled the bed assembly screws, and even removed the Z nut, hoping maybe some plastic had found it's way into the threads. everything seemed fine. There is some light wobble to the z nut , is that normal?
Got everything back together, belts "seem" fine to me, I have 5 printers, fairly familiar with proper tension, and they feel about the same as my other UM2 that is working great.
Did I read somewhere that on the UM2's you adjust tension inside the square brackets? Or is it still just a matter of adding tensioners?
Anyway, after take apart, cleaning, checking every pulley set screw and reassembly.
Still this... Aaaargh.
I'm thinking maybe new belts all around may be the next trick. Tension seems fine, but after 1300hrs or so, maybe the teeth are just too worn...
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gr5 2,295
The way the pattern is different at the holes - that could definitely be a belt issue.
The many many horizontal lines (turned vertical for the photo) are caused by Z issues - some layers the z screw doesn't move enough and you get over extrusion because you are printing too much plastic into too small of a space and then the next layer it corrects and moves farther.
Try adding a drop of light oil to each of the 2 Z rods and with power off push the bed up and down 5 or 10 times past the oil. Check for bad spots where it feels rough. Then add a drop of green grease to the threaded z shaft. Check that all the screws are tight *under* the bed - especially the 4 on the z nut. I think you have to remove the cover that says "ultimaker" on it just above the back of the bed to get to the screws for the 2 linear bearings.
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